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High Temperature Low Pressure Carburizing with Prenitriding Process - The Economic Option for Vacuum Carburizing


Paper Type 
Contributed Paper
Title 
High Temperature Low Pressure Carburizing with Prenitriding Process - The Economic Option for Vacuum Carburizing
Author 
Piotr Kula*, Robert Pietrasik, Sylwester Paweta, Konrad Dybowski, Lukasz Kaczmarek, et al.
Email 
piotr.kula@p.lodz.pl
Abstract:

The original idea of grain growth limitration by preliminary nitriding proceeding low pressure carburizing (LPC) is presented as a useful option for the FineCarb® technology. This new process called PreNitiLPC® enables high temperature carburizing up to 1050°C for a variety of common carburizing steels without any adverbs efforts on both microstructural or performance. The shortening of carburizing time may result in a decrease in manufacturing consumption from 5-50% depending on the case depth. This has been confirmed on the basis of several pilot industrial installations.

                The metallurgical background of PreNitLPC® has been discussed at the microstructural level. The mechanism of nanonitrides precipitation has been found as the effective way for intensive nucleation of austenite grains and for inhibition of grain boundary movement at significantly high temperatures. The results of comparative investigations of fatigue and impact strength as well as pitting resistance for traditional endothermic gas carburizing (ENDO), standard LPC and PreNitLPC® are presented. They confirm the efficiency of the pre-nitriding option in grain growth limitation for plain carbon and low alloying steels enabling high mechanical properties to be achieved in machine parts hardened using preNitLPC® .

The problem of increased carburizing temperature on heat treatment distortion is also discussed. The results of comparative geometrical measurements show the possibility to keep the distortion level from the high temperature carburizing similar to that for traditional ENDO carburizing, although this requires additional optimization of the PreNitLPC® parameters.

Start & End Page 
865 - 873
Received Date 
Revised Date 
Accepted Date 
Full Text 
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Keyword 
vacuum carburizing, case hardening, costs assessment, fatigue strength
Volume 
Vol.40 No.5 SPECIAL ISSUE 1
DOI 
Citation 
Kula P., Pietrasik R., Paweta S., Dybowski K., Kaczmarek L. and Al. E., High Temperature Low Pressure Carburizing with Prenitriding Process - The Economic Option for Vacuum Carburizing, Chiang Mai J. Sci., 2013; 40(5): 865-873.
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Chiang Mai Journal of Science

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